How to Remove Element from an Array: JavaScript

Removing elements from a JavaScript array is a common programming paradigm that developers often run into. As with a lot of things JavaScript, this isn’t as simple as it probably should be. There are actually several ways to remove one or more elements from an array so let’s go through each of them one by one.

Removing One Element Using splice():

The splice() method is a versatile way of removing, replacing, and/or adding elements in an array. It works similarly to splice() functions in other languages. Basically, you take an array and selectively remove portions of it. The inputs to the splice() function are the index point to start at and the number of elements to remove. Also, remember that arrays are zero-indexed in JavaScript.

["AA", "AB", "AC", "AD"]                                                                                                             list.splice(2, 1)                                                                                                                                   // Starting at index position 2, remove one element                                                                                 ["AA", "AB", "AD"]                                                                                                                    list.splice(2,2)                                                                                                                                   // Starting at index position 2, remove two elements                                                                                           output: ["AA", "AB"]

Removing One Element Using pop():

The array methods push() and pop() work on the the end of an array. The terms push() and pop() come from the idea of a stack and queue. This implements the idea of a Last-In-First-Out data structure (LIFO). The push() method will ADD an element to the array and the pop() method will remove one. To remove the last element of an array:

["AA", "AB", "AC", "AD"]                                                                                                                    list.pop()                                                                                                                                    output: ["AA", "AB", "AC"]

Removing One Element Using shift():

The array methods shift() and unshift() work on the beginning of an array instead of the end of an array, as is the case with push() and pop(). The shift() command will remove the first element of the array and the unshift() command will add an element to the beginning of the array.

["AA", "AB", "AC", "AD"]                                                                                                                  list.shift()                                                                                                                                  output: ["AB", "AC", "AD"]

Searching and Removing a Specific Element by Value:

The indexOf() command returns the first index at which a given element can be found in the array, or -1 if it is not present. This can be used along with splice() to search for an element and then remove it, even if you don’t know where it is in the array.

Let’s remove the "AC" element:

["AA", "AB", "AC", "AD"]                                                                                         list.splice( list.indexOf('AC'), 1 );                                                                                                               // Find the index position of "AC," then remove one element from that position                                                                 output: ["AA", "AB", "AD"]

Removing Multiple Specific Elements

Let’s add an extra "AC" element to our array, and then remove all occurrences of "AC":

["AA", "AB", "AC", "AC", "AD"]                                                                                               for( var i = list.length-1; i--;){                                                                          if ( list[i] === 'AC') list.splice(i, 1);}                                                                                                    output: ["AA", "AB", "AD"]

Note that we could also have used the filter()method for this operation, but that would have created a new array, as filter() does not mutate the array on which it is called. Perform a lot of filtering using the filter() method might clean up your code quite a bit.



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With more new programming languages being released day by day it is getting difficult for the programmers to keep track and learn every new programming language.

One must understand that decision to learn new programming language should solely be based on following 3's.

  • Your aspirations
  • Your organisation's need
  • Your project's need
  • In this article we are going to discuss top 5 programming languages recommended for 2019. We will also touch briefly on the importance of each language.

    Python

    A must learn programming language with AI, ML, data analytics, algorithm-based development suddenly catching loads of world attention. With high demands of automation in industry, Python has suddenly become extremely important for developers to acquire and learn.

    Python can be used develop a wide range of applications. 

    Python Applications

     

    Web Development:  Python is good for improving a web application without much complexity.  The language comes with a rich collection of libraries and internet protocols like

     

    • Requests - assigned to the HTTP client library
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    It also has a very active framework like Django, Pyramid and microframeworks like flask and bottle which serves users in swift and dynamic web development.       

     

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    • SciPy - it is a collection of packages for mathematics, science, and engineering.
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    Game Development: Programmers can develop games applying python even though most favoured structure for game development is Unity, python does have PyGame, PyKyra structures for game-development with Python. Users can get a mixture of 3D-rendering libraries to generate 3D games.

    GO

    Being an open source programming language Go makes it simple to create simple, secure, and productive software. It is also one of the latest players in the programming platform.Go was formulated in 2007 and officially published in 2012 and was ratified at Google to advance programming richness, in a period of multicore processors, computer networks, and large codebases. The designers aspired to fix general criticisms of other languages while retaining many of their valuable characteristics like:

     

    • Static typing and efficiency (offered by C++ or Java)
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    • Go encompass all the efficiency of python and performance of conventional languages like C++ and Java to help users build scalable applications.

    The language has raised lots of hope for the upcoming class of coding geeks.As it has features of Python, JS, Java. But it is slowly becoming one of the most assuring languages to study and adopt in the future.

     

    Importance Of Go: Go’s growing usage is anticipated, because of its lightweight, open source language revised for today’s microservices designs. Container Docker and Google’s container orchestration outcome Kubernetes are developed using Go. Go is also obtaining ground in data science, with depths that data scientists are studying for in overall execution.

    JavaScript

    For web developers, Javascript is the most favoured language and it will be very hard to find a job in the web development platform without knowledge of Javascript. It is an object-oriented programming language. It is one of the most conventional programming languages in this modern digital world.

     

    Besides HTML and CSS, JavaScript is quintessential to front-end web development. A majority of the web’s most successful sites, from Facebook and Twitter to Gmail and YouTube, rely on JavaScript to design interactive web pages and dynamically display content to users.

     

    In extension to absolute JavaScript, there are various libraries and frameworks designed to make JavaScript development easier. Some of the most accessible frameworks include Angular, React, Vue, Ember and jQuery. Professional JavaScript developers will likely need practice with one or more of these.

     

    Although JavaScript is fundamentally a front-end language run on the browser, it can also be practised on the server-side throughout Node.js to create scalable network applications. Node.js is congenial with Linux, SunOS, Mac OS X and Windows.JavaScript has an accepting, compliant syntax and works over all major browsers, it is one of the favourable programming languages for beginners.

     

    Use cases: Websites like WordPress, LinkedIn, Amazon, Microsoft etc utilise JavaScript language.

    Swift

    Swift is a comprehensive purpose language which was generated by Apple for applications that are applied to their multiple operating systems. Swift is assuredly the best programming language to learn if aspirants liked to acquire or work with Apple programs and applications. Although it was only published four years ago, in 2014, the demand for Swift developers has increased exponentially. It is now one of the most popularly used languages in the world, and aspirants job prospects will be bright if one decides to learn it.

     

    Due to the tremendous need for experienced Swift developers, the average programmer who knows how to use the language can expect huge pay cheque. The language has advantages like cleaner syntax and limited low-level juggling of pointers

    Scala

    Scala implements functional programming assistance and strong static type system, which makes it an excellent general purpose programming language.The user will be able to commence applying functional programming techniques to support user-developed applications and overcome issues that result from unintended consequences. The provision of shifting from mutable data structures to immutable data structures and from conventional methods to absolute functions that have no impact on their environment, user code will be maintained, more stable, and much simpler to comprehend.

     

    Our recommendation - If you are still new to these five programming languages then we will strongly recommend to learn Python in 2019. You can start by looking at basic python youtube tutorials.

    If you already know Python then go for GO Language. Start with this basic Go lang tutorial.

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